Pressureless Sintering of SiC-Whisker-Reinforced Al2O3 Composites: I, Effect of Matrix Powder Surface Area

1990 ◽  
Vol 73 (7) ◽  
pp. 1884-1893 ◽  
Author(s):  
Hae-Weon Lee ◽  
Michael D. Sacks
Keyword(s):  
Surface Area ◽  
Pressureless Sintering ◽  
Powder Surface ◽  
Matrix Powder

Mechanical Properties of PM CNT-Dispersed Cu Composite

2017 ◽  
Vol 737 ◽  
pp. 320-325 ◽  
Author(s):  
Hisashi Imai ◽  
Katsuyoshi Kondoh ◽  
Junko Umeda
Keyword(s):  
Mechanical Properties ◽  
Surface Area ◽  
Composite Powder ◽  
Pure Copper ◽  
Surfactant Solution ◽  
Rolling Process ◽  
Powder Rolling ◽  
Zwitterionic Surfactant ◽  
Powder Surface ◽  
Strengthening Factor

Microstructural and mechanical properties of powder metallurgy (PM) with carbon nanotube (CNTs) dispersed copper (Cu) composites were investigated in detail. Pure copper powder was coated with un-bundled CNTs by using the zwitterionic surfactant solution containing CNTs. The powder rolling process was applied to increase the powder surface area to be coated with CNTs. The total rolling reduction of Cu-CNT composite powder by 5 steps rolling was about 75%. With increasing the number of rolling steps, the content of CNTs coated on the Cu powder surface increased because of the increment of the flat surface area of flaky Cu rolled powder. As a result, the CNT content was 0.67mass% after 5 steps powder rolling. It was about twice as that of as-coated Cu-CNT composite powder without rolling. The grain size of PM extruded Cu-CNT composite was about one fifth of that of the extruded monolithic Cu material without CNT. Yield stress of the extruded Cu-CNT composite via the rolling process was 192 MPa, which is about twice that of the extruded monolithic Cu material (88 MPa). CNTs distributed at primary particle boundaries were effective to prevent the grain coarsening by their pinning effects, and this grain refinement was the main strengthening factor of the Cu-CNT composite via rolling process.

Extruded Al–Al2O3 composites formed in situ during consolidation of ultrafine Al powders: Effect of the powder surface area

2011 ◽  
Vol 529 ◽  
pp. 131-137 ◽  
Author(s):  
Martin Balog ◽  
Frantisek Simancik ◽  
Martin Walcher ◽  
Walter Rajner ◽  
Cecilia Poletti
Keyword(s):  
Surface Area ◽  
Powder Surface

Introduction to Powder Surface Area

1980 ◽  
Vol 40 (3) ◽  
pp. 439
Author(s):  
D. Dollimore
Keyword(s):  
Surface Area ◽  
Powder Surface

scholarly journals Introduction to powder surface area (Lowell, S.)

1981 ◽  
Vol 58 (11) ◽  
pp. A345
Author(s):  
E. W. Anacker
Keyword(s):  
Surface Area ◽  
Powder Surface

Powder surface area and porosity

1984 ◽  
Vol 5 (6) ◽  
pp. 295
Author(s):  
Christine Chalk
Keyword(s):  
Surface Area ◽  
Powder Surface

Powder Surface Area and Porosity

1991 ◽  
Author(s):  
S. Lowell ◽  
Joan E. Shields
Keyword(s):  
Surface Area ◽  
Powder Surface
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